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If the piston is all the way up witch valve is opened

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This is not my area of expertise, but as far as i understand

If its at the top stroke, it should be ready to receive the fuel and ignition for the down stoke

If so, the top valves are open for fuel to enter , the bottom valves for the exhaust should be closed.
Hope it helps

try this

http://auto.howstuffworks.com/engine2.htm

Posted on Apr 21, 2017

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None. either it is on compression or one vale has just about closed and another is opening

Posted on Apr 21, 2017

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3 Answers

It seems to me that if the belt breaks , even on an interference engine: the valves will slam shut . Maybe it 50/50 chance either way.


belt has to be replaced any way
compression test on the cylinders.. tells you straight away
zero or low compression numbers ..valves bent

in an interference engine OHC or DOHC belt breaks
the cams stop dead and pistons continue to move up and down

non interference there is a gap between pistons and valves

26334765-xld5pokq11zihdmvndqke0w0-4-0.jpg

26334765-xld5pokq11zihdmvndqke0w0-4-1.gif

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1 Answer

I believe the timing marks no longer line up after replacing my timing belt. How can I determine if correction is needed? How do I correct timing mark alignment?


there is a method but you will have to have an understanding of valve timing
in an engine regardless of number of pistons when number 1 piston is TDC not firing, then the exhaust valve will be open and ready to close and the inlet valve will be closed and ready to open
so bring the piston up and near tdc
as you approach tdc you will see the exhaust start to close and at the same time the inlet valve will start to open
if you rock the crank back and forward slightly at tdc you will see that the valves are rocking
this is valve rock and indicates the cam is in time with the crank
it is only necessary to do it with no 1 piston
It doesn't matter how many cam shafts ( one cam shaft can be inlet valves only and the other can be exhaust valves only) there are, it is the exhaust and inlet valves for no 1 piston that you are looking at
how do you get tdc-- remove a plug and with a piece of wire place the end on the piston crown and as the piston comes up the wire will be pushed out as you rock the piston the wire will move in and out and the point before movement is tdc
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After top dead center what valve starts opening number 1 intake or number 1 exhaust?


It depends on which TDC you are talking about, compression TDC or exhaust TDC. On the compression stroke, no valves will open after TDC-this is when combustion has occured, the power stroke. When the piston reaches bottom and starts up on the exhaust stroke, then exhaust valve will open. At TDC of exhaust stroke, exhaust valve will be closed, and the intake valve will then open as piston is moving down.
If you have the intake valve opening right after TDC, you are on the exhaust stroke of that cylinder. The exhaust valve is only open during upward movement of the piston on the exhaust stroke. Immediately after TDC of exhaust stroke, the intake will open as the piston travels downward.

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Does valves have to be closed when engine is at tdc on 2002 mitsubishi eclipse 2.4


The valves for any given cylinder will be closed when that particular cylinder is at TDC and on the "firing" cycle. Since 4 cycle engines have four "cycles" the piston can be at TDC twice. Once for firing and once when the exhaust cycle is completed and the intake cycle is starting.

Cycle 1: Intake valve is open and piston is travelling DOWN. (Intake)
Cycle 2: Both valves are closed and the piston is travelling UP (compression)
Cycle 3: Fuel has been ignited and the piston is travelling DOWN ( power)
Cycle 4: Exhaust valve is open and the piston is travelling UP (exhaust)

TDC is Top Dead Center, or the point that the piston is at the top of it's travel.

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Making sure i'm on the compression stroke


Hi,
The compression stroke is when the piston is traveling UP and the intake and exhaust valves are both closed.

Intake: Piston going down, intake valve open, exhaust valve closed
Compression: Piston going up, intake and exhaust valves closed
Power: Piston going down, intake and exhaust valves closed
Exhaust: Piston going up., intake valve closed, exhaust valve open

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yes it will bend valves
in witch you would have to have your head removed and hope you dont need new pistons
it will cost you a very large amount to fix

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On the 960 volvo if i broke atimeing belt while driveing dont the pistons come up as far as the crank will let it and the valves stop where they are at if not why dont the pistons hit the valves while its...


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